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  <div class="question_difficulty">
   难度：Hard
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   <h1 class="question_title">
    273. Integer to English Words
   </h1>
   <p>
    Convert a non-negative integer to its english words representation. Given input is guaranteed to be less than 2
    <sup>
     31
    </sup>
    - 1.
   </p>
   <p>
    <b>
     Example 1:
    </b>
   </p>
   <pre>
<b>Input:</b> 123
<b>Output:</b> "One Hundred Twenty Three"
</pre>
   <p>
    <b>
     Example 2:
    </b>
   </p>
   <pre>
<b>Input:</b> 12345
<b>Output:</b> "Twelve Thousand Three Hundred Forty Five"</pre>
   <p>
    <b>
     Example 3:
    </b>
   </p>
   <pre>
<b>Input:</b> 1234567
<b>Output:</b> "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven"
</pre>
   <p>
    <b>
     Example 4:
    </b>
   </p>
   <pre>
<b>Input:</b> 1234567891
<b>Output:</b> "One Billion Two Hundred Thirty Four Million Five Hundred Sixty Seven Thousand Eight Hundred Ninety One"
</pre>
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   <h1 class="question_title">
    273. 整数转换英文表示
   </h1>
   <p>
    将非负整数转换为其对应的英文表示。可以保证给定输入小于&nbsp;2
    <sup>
     31
    </sup>
    - 1 。
   </p>
   <p>
    <strong>
     示例 1:
    </strong>
   </p>
   <pre><strong>输入:</strong> 123
<strong>输出:</strong> "One Hundred Twenty Three"
</pre>
   <p>
    <strong>
     示例 2:
    </strong>
   </p>
   <pre><strong>输入:</strong> 12345
<strong>输出:</strong> "Twelve Thousand Three Hundred Forty Five"</pre>
   <p>
    <strong>
     示例 3:
    </strong>
   </p>
   <pre><strong>输入:</strong> 1234567
<strong>输出:</strong> "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven"</pre>
   <p>
    <strong>
     示例 4:
    </strong>
   </p>
   <pre><strong>输入:</strong> 1234567891
<strong>输出:</strong> "One Billion Two Hundred Thirty Four Million Five Hundred Sixty Seven Thousand Eight Hundred Ninety One"</pre>
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